Antenna arrangement for a portable radio communication device having a metal casing

Abstract

An exemplary embodiment includes an antenna arrangement for a portable radio communication device having a metal casing. The antenna arrangement generally includes a first antenna device and a second antenna device. The first antenna device comprises the metal casing and has a first radiating antenna pattern. The second antenna device has a second radiating antenna pattern. The second antenna device is outside the metal casing.

1 . An antenna arrangement for a portable radio communication device having a metal casing, the antenna arrangement comprising:
 a first antenna device having a first radiating antenna pattern, the first antenna device comprising the metal casing; and   a second antenna device having a second radiating antenna pattern essentially uncorrelated to the first radiating antenna pattern, the second antenna device is outside the metal casing.   
     
     
         2 . The antenna arrangement of  claim 1 , wherein:
 the first antenna device comprises:
 a front side part of the metal casing, 
 a first back side part connected to the front side part through a top side part of the metal casing; 
 a second back side part connected to the front side part through a bottom side part of the metal casing; 
   the bottom and top side parts are positioned at opposite ends of the front side part, the first and second back side parts are positioned and distanced from each other by a gap, and the second back side part comprises a feed point positioned at the gap;   the second antenna device comprises a multi-band antenna structure; and   the front side part of the metal casing is a ground plane device shared by the first and second antenna devices.   
     
     
         3 . The antenna arrangement of  claim 2 , wherein the feed point is positioned at a corner at the gap. 
     
     
         4 . The antenna arrangement of  claim 2 , wherein:
 the metal casing comprises an indentation; and   the second antenna is arranged in the indentation.   
     
     
         5 . The antenna arrangement of  claim 2 , wherein the second antenna device is arranged off-ground relative to the ground plane device. 
     
     
         6 . The antenna arrangement of  claim 2 , wherein the first back side part comprises a feed point positioned at the gap. 
     
     
         7 . The antenna arrangement of  claim 6 , wherein the feed point of the first back side part is positioned adjacent the feed point of the second back side part. 
     
     
         8 . The antenna arrangement of  claim 2 , wherein the first and second back side parts comprises edge portions folded towards the front side part. 
     
     
         9 . The antenna arrangement of  claim 2 , wherein the first and/or the second back side parts protrude outside of the front side part. 
     
     
         10 . The antenna arrangement of  claim 2 , wherein the first and second back side parts have gap edge profiles that are mirror-shaped. 
     
     
         11 . The antenna arrangement of  claim 2 , wherein the first and the second back side parts are coplanar. 
     
     
         12 . The antenna arrangement of  claim 1 , wherein:
 the first antenna device has a far-field radiating antenna pattern that is directive; and   the second antenna device has a far-field radiating antenna pattern that is non-directive.   
     
     
         13 . The antenna arrangement of  claim 1 , wherein:
 the first antenna device is a main antenna; and   the second antenna device is a diversity antenna for at least some operating frequencies of the main antenna.   
     
     
         14 . The antenna arrangement of  claim 1 , wherein:
 the second antenna device is a main antenna; and   the first antenna device is a diversity antenna for at least some operating frequencies of the main antenna.   
     
     
         15 . A portable radio communication device comprising an antenna arrangement according to  claim 1 . 
     
     
         16 . A portable radio communication device comprising:
 a metal casing including a front side part, a first back side part connected to the front side part through a top side part of the metal casing, and a second back side part connected to the front side part through a bottom side part of the metal casing, the top and bottom side parts are positioned at opposite ends of the front side part, the first and second back side parts are positioned and distanced from each other by a gap;   a first antenna device having a first radiating antenna pattern, the first antenna device comprising the metal casing;   a second antenna device having a second radiating antenna pattern, the second antenna device outside the metal casing; and   the front side part of the metal casing is operable as a ground plane device shared by the first and second antenna devices.   
     
     
         17 . The portable radio communication device of  claim 16 , wherein:
 the first back side part comprises a feed point positioned at the gap, the second back side part comprises a feed point positioned at the gap, and the feed point of the first back side part is positioned adjacent the feed point of the second back side part; and/or   the metal casing comprises an indentation, and the second antenna is arranged in the indentation; and/or   the second antenna device is arranged off-ground relative to the ground plane device.   
     
     
         18 . The portable radio communication device of  claim 16 , wherein:
 the first antenna device has a far-field radiating antenna pattern that is directive, and the second antenna device has a far-field radiating antenna pattern that is non-directive; and/or   one of the first and second antenna devices is a main antenna, and the other one of the first and second antenna devices is a diversity antenna for at least some operating frequencies of the main antenna.   
     
     
         19 . A radio communication device comprising:
 a metal casing including a front side part, a first back side part connected to the front side part through a top side part of the metal casing, and a second back side part connected to the front side part through a bottom side part of the metal casing, the top and bottom side parts are positioned at opposite ends of the front side part, the first and second back side parts are positioned and distanced from each other by a gap;   a first antenna device having a first radiating antenna pattern, the first antenna device comprising the metal casing;   a second antenna device having a second radiating antenna pattern, the second antenna device outside the metal casing;   the front side part of the metal casing is operable as a ground plane device shared by the first and second antenna devices;   whereby the first antenna device has a far-field radiating antenna pattern that is directive, and the second antenna device has a far-field radiating antenna pattern that is non-directive; and/or   whereby one of the first and second antenna devices is a main antenna, and the other one of the first and second antenna devices is a diversity antenna for at least some operating frequencies of the main antenna.   
     
     
         20 . The radio communication device of  claim 19 , wherein:
 the first back side part comprises a feed point positioned at the gap, the second back side part comprises a feed point positioned at the gap, and the feed point of the first back side part is positioned adjacent the feed point of the second back side part; and/or   the metal casing comprises an indentation, and the second antenna is arranged in the indentation; and/or   the second antenna device is arranged off-ground relative to the ground plane device.